09-19-2009, 08:57 AM
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The middle section had an airtube in it with a stone. The clear, square plastic, box has a trap in it where I was hoping the bubbles would overflow into. But it is sitting too high in the compartment for the bubbles to reach. The first compartment, where the water enters the tank has a slit cut into the plastic wall about halfway down, allowing the water to flow into the center compartment. The "trap" sits inside this middle compartment. It has an overflow compartment, that I thought the bubbles would be collected. But no workee, sits too high above the water. The slit for the third compartment is at the bottom of the wall. This is where the powerhead is located. I get excellent water flow, just no trapped bubbles. When I got it, I was not able to see it put together, so I am guessing on a lot of stuff. The way the water flows thru the entire box may be all wrong for a skimmer. Oh well!!